One of my first python projects, so have mercy please :)
But it still works so enjoy!!!
Very simple. Try and make some interesting alterations to it. But good, quite good.
This is a great program! You can shorten the program even more by using the eval() function. What it does is that you can take strings and input them into the eval function. an example would be eval('1' '+' '2'). This way, your code can go from 70 lines to around 20 or less.